What happened to the dads:
Red's dad is dead
Ethan's/Lyra's/Kris's is an overworked salaryman who rarely visits his family
Lucas's/Dawn's dad was kidnapped by yakuza
Hilbert's/Hilda's mom is a lesbian and in love with Professor Juniper and Nate's/Rosa's mom the same is true for Nate's/Rosa's mom
Grace is divorced
Elio's/Chicken's dad was lost on an island
Victor's/Gloria's dad is in prison
Florian's/Juliana's father left his wife for a whore in Kalos